Null-check argument to ConnectivityManager.releaseNetworkRequest(PendingIntent)

Do this in ConnectivityService to prevent crashing framework.

Bug:21329396
Change-Id: Ifd9c970cd0da392d0bd5da9a9ae845fdf0b559b3
1 file changed
tree: 27f6c101ab477eef6e967baa245090e20243c7d7
  1. core/
  2. services/
  3. tests/